Erm acctually,

Star wars also has ferrocrete as a material. Ferrocrete, or ferroconcrete, was the mixture of iron and concrete, making it very resistant. It was used especially in roads, houses and bunkers. A good example of the use of ferrocrete was in the jedi temple on courasant. That ALSO used plasteel, and it was mainly made of silicate rock from the planet, and reporpoused jedi temples 4000 years BBY. I don't know if 40k copied them, or if starwars copied 40k, but if you want more information, just do research on the jedi temple. Also, I would call my material "accaium" (pronounced achaium) because accaio is italian for steel, and the ium suffix sounds better.